Issue 3179

Resolves issue: http://code.google.com/p/otwarchive/issues/detail?id=3179

Added a 'Decline All' button, which sets all invitation code requests to '0' and then updates. It also send an email out to each user to let them know that their request has been declined. 

Created a new email which can be used for future functionality. The email lets users know that their request for more invitation codes has been declined.